Blended graphene dispersions

A method of forming an aqueous dispersion of graphenic carbon particles, comprising:

• a) mixing a polymeric resin dispersant prepared from vinyl pyrrolidone into water;
• and
• b) dispersing two or more different types of graphenic carbon nanoparticles into the water to form an aqueous dispersion, wherein the graphenic carbon nanoparticles are present in the aqueous dispersion in an amount greater than 1 weight percent based upon a total weight of the aqueous dispersion, and wherein the graphenic carbon nanoparticles comprise:
• i) thermally produced graphenic carbon nanoparticles TG;
• and
• ii) base graphene particles BG different from the thermally produced graphenic carbon nanoparticles TG;
• and wherein a weight ratio of the graphenic carbon nanoparticles TG and BG to the polymeric resin dispersant is greater than 5:1, and the aqueous dispersion has an instability index of less than 0.7, and wherein a weight ratio of the thermally produced graphenic carbon nanoparticles TG to base graphene particles BG is greater than 0.1:1.